Which of the following are combination reactions-i 4 K - O 2- 2 K 2 Oii CuSO 4-2 NH 4 OH - NH 42 SO 4- Cu OH 2iii 2 ZnS -3 O 2- 2 ZnO -2 SO 2iv Na 2 O - H 2 O - 2 NaOHA- Reactions i and iiB- Reactions ii and iiiC- Reactions i and ivD- Reactions ii and iv

You visited us 4 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard VIII

Chemistry

Oxidation Reduction Reaction

Which of the ...

Question

Which of the following are combination reactions?

i) 4K + O₂ → 2K₂O

ii) CuSO₄+ 2NH₄OH → (NH₄)₂SO₄+ Cu(OH)₂

iii) 2ZnS + 3O₂ → 2ZnO + 2SO₂

iv) Na₂O + H₂O → 2NaOH

Reactions (i) and (iv)

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Reactions (ii) and (iv)

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Reactions (i) and (ii)

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Reactions (ii) and (iii)

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A
Reactions (i) and (iv)

A chemical reaction in which two or more substances combine to form a single product is called a combination reaction.

Suggest Corrections

Similar questions

Which of the following are examples of combination reactions?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

Q. Question 18
Which of the following are combination reactions?

(i)

2 {KClO}_{3} Heat \to 2 KCl + 3 O_{2}

(ii)

MgO + H_{2} O \to {Mg(OH)}_{2}

(iii)

4 Al + 3 O_{2} \to 2 {Al}_{2} O_{3}

(iv)

Zn + {FeSO}_{4} \to {ZnSO}_{4} + Fe

(a) (i) and (iii)
(b) (iii) and (iv)
(c) (ii) and (iv)
(d) (ii) and (iii)

Q. Question 18
Which of the following are combination reactions?

(i)

2 {KClO}_{3} Heat \to 2 KCl + 3 O_{2}

(ii)

MgO + H_{2} O \to {Mg(OH)}_{2}

(iii)

4 Al + 3 O_{2} \to 2 {Al}_{2} O_{3}

(iv)

Zn + {FeSO}_{4} \to {ZnSO}_{4} + Fe

(a) (i) and (iii)
(b) (iii) and (iv)
(c) (ii) and (iv)
(d) (ii) and (iii)

Q. Which of the following reaction(s) has a positive entropy change?

(I) A g^{+} (a q) + C l^{-} (a q) \to A g C l (s) (I I) N H_{4} C l (s) \to N H_{3} (g) + H C l (g) (I I I) 2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)

Which of the following are examples of combination reaction?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

Join BYJU'S Learning Program

Which of the following are combination reactions? i) 4K + O2 → 2K2O ii) CuSO4 + 2NH4OH → (NH4)2SO4 + Cu(OH)2 iii) 2ZnS + 3O2 → 2ZnO + 2SO2 iv) Na2O + H2O → 2NaOH

The correct option is A Reactions (i) and (iv) A chemical reaction in which two or more substances combine to form a single product is called a combination reaction.

Which of the following are combination reactions?

i) 4K + O₂ → 2K₂O

ii) CuSO₄+ 2NH₄OH → (NH₄)₂SO₄+ Cu(OH)₂

iii) 2ZnS + 3O₂ → 2ZnO + 2SO₂

iv) Na₂O + H₂O → 2NaOH

The correct option is A
Reactions (i) and (iv)

A chemical reaction in which two or more substances combine to form a single product is called a combination reaction.